Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland...
[linux-2.6.git] / drivers / infiniband / core / mad_rmpp.c
1 /*
2  * Copyright (c) 2005 Intel Inc. All rights reserved.
3  * Copyright (c) 2005-2006 Voltaire, Inc. All rights reserved.
4  *
5  * This software is available to you under a choice of one of two
6  * licenses.  You may choose to be licensed under the terms of the GNU
7  * General Public License (GPL) Version 2, available from the file
8  * COPYING in the main directory of this source tree, or the
9  * OpenIB.org BSD license below:
10  *
11  *     Redistribution and use in source and binary forms, with or
12  *     without modification, are permitted provided that the following
13  *     conditions are met:
14  *
15  *      - Redistributions of source code must retain the above
16  *        copyright notice, this list of conditions and the following
17  *        disclaimer.
18  *
19  *      - Redistributions in binary form must reproduce the above
20  *        copyright notice, this list of conditions and the following
21  *        disclaimer in the documentation and/or other materials
22  *        provided with the distribution.
23  *
24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31  * SOFTWARE.
32  */
33
34 #include "mad_priv.h"
35 #include "mad_rmpp.h"
36
37 enum rmpp_state {
38         RMPP_STATE_ACTIVE,
39         RMPP_STATE_TIMEOUT,
40         RMPP_STATE_COMPLETE
41 };
42
43 struct mad_rmpp_recv {
44         struct ib_mad_agent_private *agent;
45         struct list_head list;
46         struct delayed_work timeout_work;
47         struct delayed_work cleanup_work;
48         struct completion comp;
49         enum rmpp_state state;
50         spinlock_t lock;
51         atomic_t refcount;
52
53         struct ib_ah *ah;
54         struct ib_mad_recv_wc *rmpp_wc;
55         struct ib_mad_recv_buf *cur_seg_buf;
56         int last_ack;
57         int seg_num;
58         int newwin;
59         int repwin;
60
61         __be64 tid;
62         u32 src_qp;
63         u16 slid;
64         u8 mgmt_class;
65         u8 class_version;
66         u8 method;
67 };
68
69 static inline void deref_rmpp_recv(struct mad_rmpp_recv *rmpp_recv)
70 {
71         if (atomic_dec_and_test(&rmpp_recv->refcount))
72                 complete(&rmpp_recv->comp);
73 }
74
75 static void destroy_rmpp_recv(struct mad_rmpp_recv *rmpp_recv)
76 {
77         deref_rmpp_recv(rmpp_recv);
78         wait_for_completion(&rmpp_recv->comp);
79         ib_destroy_ah(rmpp_recv->ah);
80         kfree(rmpp_recv);
81 }
82
83 void ib_cancel_rmpp_recvs(struct ib_mad_agent_private *agent)
84 {
85         struct mad_rmpp_recv *rmpp_recv, *temp_rmpp_recv;
86         unsigned long flags;
87
88         spin_lock_irqsave(&agent->lock, flags);
89         list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
90                 cancel_delayed_work(&rmpp_recv->timeout_work);
91                 cancel_delayed_work(&rmpp_recv->cleanup_work);
92         }
93         spin_unlock_irqrestore(&agent->lock, flags);
94
95         flush_workqueue(agent->qp_info->port_priv->wq);
96
97         list_for_each_entry_safe(rmpp_recv, temp_rmpp_recv,
98                                  &agent->rmpp_list, list) {
99                 list_del(&rmpp_recv->list);
100                 if (rmpp_recv->state != RMPP_STATE_COMPLETE)
101                         ib_free_recv_mad(rmpp_recv->rmpp_wc);
102                 destroy_rmpp_recv(rmpp_recv);
103         }
104 }
105
106 static void format_ack(struct ib_mad_send_buf *msg,
107                        struct ib_rmpp_mad *data,
108                        struct mad_rmpp_recv *rmpp_recv)
109 {
110         struct ib_rmpp_mad *ack = msg->mad;
111         unsigned long flags;
112
113         memcpy(ack, &data->mad_hdr, msg->hdr_len);
114
115         ack->mad_hdr.method ^= IB_MGMT_METHOD_RESP;
116         ack->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_ACK;
117         ib_set_rmpp_flags(&ack->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
118
119         spin_lock_irqsave(&rmpp_recv->lock, flags);
120         rmpp_recv->last_ack = rmpp_recv->seg_num;
121         ack->rmpp_hdr.seg_num = cpu_to_be32(rmpp_recv->seg_num);
122         ack->rmpp_hdr.paylen_newwin = cpu_to_be32(rmpp_recv->newwin);
123         spin_unlock_irqrestore(&rmpp_recv->lock, flags);
124 }
125
126 static void ack_recv(struct mad_rmpp_recv *rmpp_recv,
127                      struct ib_mad_recv_wc *recv_wc)
128 {
129         struct ib_mad_send_buf *msg;
130         int ret, hdr_len;
131
132         hdr_len = ib_get_mad_data_offset(recv_wc->recv_buf.mad->mad_hdr.mgmt_class);
133         msg = ib_create_send_mad(&rmpp_recv->agent->agent, recv_wc->wc->src_qp,
134                                  recv_wc->wc->pkey_index, 1, hdr_len,
135                                  0, GFP_KERNEL);
136         if (!msg)
137                 return;
138
139         format_ack(msg, (struct ib_rmpp_mad *) recv_wc->recv_buf.mad, rmpp_recv);
140         msg->ah = rmpp_recv->ah;
141         ret = ib_post_send_mad(msg, NULL);
142         if (ret)
143                 ib_free_send_mad(msg);
144 }
145
146 static struct ib_mad_send_buf *alloc_response_msg(struct ib_mad_agent *agent,
147                                                   struct ib_mad_recv_wc *recv_wc)
148 {
149         struct ib_mad_send_buf *msg;
150         struct ib_ah *ah;
151         int hdr_len;
152
153         ah = ib_create_ah_from_wc(agent->qp->pd, recv_wc->wc,
154                                   recv_wc->recv_buf.grh, agent->port_num);
155         if (IS_ERR(ah))
156                 return (void *) ah;
157
158         hdr_len = ib_get_mad_data_offset(recv_wc->recv_buf.mad->mad_hdr.mgmt_class);
159         msg = ib_create_send_mad(agent, recv_wc->wc->src_qp,
160                                  recv_wc->wc->pkey_index, 1,
161                                  hdr_len, 0, GFP_KERNEL);
162         if (IS_ERR(msg))
163                 ib_destroy_ah(ah);
164         else {
165                 msg->ah = ah;
166                 msg->context[0] = ah;
167         }
168
169         return msg;
170 }
171
172 static void ack_ds_ack(struct ib_mad_agent_private *agent,
173                        struct ib_mad_recv_wc *recv_wc)
174 {
175         struct ib_mad_send_buf *msg;
176         struct ib_rmpp_mad *rmpp_mad;
177         int ret;
178
179         msg = alloc_response_msg(&agent->agent, recv_wc);
180         if (IS_ERR(msg))
181                 return;
182
183         rmpp_mad = msg->mad;
184         memcpy(rmpp_mad, recv_wc->recv_buf.mad, msg->hdr_len);
185
186         rmpp_mad->mad_hdr.method ^= IB_MGMT_METHOD_RESP;
187         ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
188         rmpp_mad->rmpp_hdr.seg_num = 0;
189         rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(1);
190
191         ret = ib_post_send_mad(msg, NULL);
192         if (ret) {
193                 ib_destroy_ah(msg->ah);
194                 ib_free_send_mad(msg);
195         }
196 }
197
198 void ib_rmpp_send_handler(struct ib_mad_send_wc *mad_send_wc)
199 {
200         if (mad_send_wc->send_buf->context[0] == mad_send_wc->send_buf->ah)
201                 ib_destroy_ah(mad_send_wc->send_buf->ah);
202         ib_free_send_mad(mad_send_wc->send_buf);
203 }
204
205 static void nack_recv(struct ib_mad_agent_private *agent,
206                       struct ib_mad_recv_wc *recv_wc, u8 rmpp_status)
207 {
208         struct ib_mad_send_buf *msg;
209         struct ib_rmpp_mad *rmpp_mad;
210         int ret;
211
212         msg = alloc_response_msg(&agent->agent, recv_wc);
213         if (IS_ERR(msg))
214                 return;
215
216         rmpp_mad = msg->mad;
217         memcpy(rmpp_mad, recv_wc->recv_buf.mad, msg->hdr_len);
218
219         rmpp_mad->mad_hdr.method ^= IB_MGMT_METHOD_RESP;
220         rmpp_mad->rmpp_hdr.rmpp_version = IB_MGMT_RMPP_VERSION;
221         rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_ABORT;
222         ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
223         rmpp_mad->rmpp_hdr.rmpp_status = rmpp_status;
224         rmpp_mad->rmpp_hdr.seg_num = 0;
225         rmpp_mad->rmpp_hdr.paylen_newwin = 0;
226
227         ret = ib_post_send_mad(msg, NULL);
228         if (ret) {
229                 ib_destroy_ah(msg->ah);
230                 ib_free_send_mad(msg);
231         }
232 }
233
234 static void recv_timeout_handler(struct work_struct *work)
235 {
236         struct mad_rmpp_recv *rmpp_recv =
237                 container_of(work, struct mad_rmpp_recv, timeout_work.work);
238         struct ib_mad_recv_wc *rmpp_wc;
239         unsigned long flags;
240
241         spin_lock_irqsave(&rmpp_recv->agent->lock, flags);
242         if (rmpp_recv->state != RMPP_STATE_ACTIVE) {
243                 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
244                 return;
245         }
246         rmpp_recv->state = RMPP_STATE_TIMEOUT;
247         list_del(&rmpp_recv->list);
248         spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
249
250         rmpp_wc = rmpp_recv->rmpp_wc;
251         nack_recv(rmpp_recv->agent, rmpp_wc, IB_MGMT_RMPP_STATUS_T2L);
252         destroy_rmpp_recv(rmpp_recv);
253         ib_free_recv_mad(rmpp_wc);
254 }
255
256 static void recv_cleanup_handler(struct work_struct *work)
257 {
258         struct mad_rmpp_recv *rmpp_recv =
259                 container_of(work, struct mad_rmpp_recv, cleanup_work.work);
260         unsigned long flags;
261
262         spin_lock_irqsave(&rmpp_recv->agent->lock, flags);
263         list_del(&rmpp_recv->list);
264         spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
265         destroy_rmpp_recv(rmpp_recv);
266 }
267
268 static struct mad_rmpp_recv *
269 create_rmpp_recv(struct ib_mad_agent_private *agent,
270                  struct ib_mad_recv_wc *mad_recv_wc)
271 {
272         struct mad_rmpp_recv *rmpp_recv;
273         struct ib_mad_hdr *mad_hdr;
274
275         rmpp_recv = kmalloc(sizeof *rmpp_recv, GFP_KERNEL);
276         if (!rmpp_recv)
277                 return NULL;
278
279         rmpp_recv->ah = ib_create_ah_from_wc(agent->agent.qp->pd,
280                                              mad_recv_wc->wc,
281                                              mad_recv_wc->recv_buf.grh,
282                                              agent->agent.port_num);
283         if (IS_ERR(rmpp_recv->ah))
284                 goto error;
285
286         rmpp_recv->agent = agent;
287         init_completion(&rmpp_recv->comp);
288         INIT_DELAYED_WORK(&rmpp_recv->timeout_work, recv_timeout_handler);
289         INIT_DELAYED_WORK(&rmpp_recv->cleanup_work, recv_cleanup_handler);
290         spin_lock_init(&rmpp_recv->lock);
291         rmpp_recv->state = RMPP_STATE_ACTIVE;
292         atomic_set(&rmpp_recv->refcount, 1);
293
294         rmpp_recv->rmpp_wc = mad_recv_wc;
295         rmpp_recv->cur_seg_buf = &mad_recv_wc->recv_buf;
296         rmpp_recv->newwin = 1;
297         rmpp_recv->seg_num = 1;
298         rmpp_recv->last_ack = 0;
299         rmpp_recv->repwin = 1;
300
301         mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr;
302         rmpp_recv->tid = mad_hdr->tid;
303         rmpp_recv->src_qp = mad_recv_wc->wc->src_qp;
304         rmpp_recv->slid = mad_recv_wc->wc->slid;
305         rmpp_recv->mgmt_class = mad_hdr->mgmt_class;
306         rmpp_recv->class_version = mad_hdr->class_version;
307         rmpp_recv->method  = mad_hdr->method;
308         return rmpp_recv;
309
310 error:  kfree(rmpp_recv);
311         return NULL;
312 }
313
314 static struct mad_rmpp_recv *
315 find_rmpp_recv(struct ib_mad_agent_private *agent,
316                struct ib_mad_recv_wc *mad_recv_wc)
317 {
318         struct mad_rmpp_recv *rmpp_recv;
319         struct ib_mad_hdr *mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr;
320
321         list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
322                 if (rmpp_recv->tid == mad_hdr->tid &&
323                     rmpp_recv->src_qp == mad_recv_wc->wc->src_qp &&
324                     rmpp_recv->slid == mad_recv_wc->wc->slid &&
325                     rmpp_recv->mgmt_class == mad_hdr->mgmt_class &&
326                     rmpp_recv->class_version == mad_hdr->class_version &&
327                     rmpp_recv->method == mad_hdr->method)
328                         return rmpp_recv;
329         }
330         return NULL;
331 }
332
333 static struct mad_rmpp_recv *
334 acquire_rmpp_recv(struct ib_mad_agent_private *agent,
335                   struct ib_mad_recv_wc *mad_recv_wc)
336 {
337         struct mad_rmpp_recv *rmpp_recv;
338         unsigned long flags;
339
340         spin_lock_irqsave(&agent->lock, flags);
341         rmpp_recv = find_rmpp_recv(agent, mad_recv_wc);
342         if (rmpp_recv)
343                 atomic_inc(&rmpp_recv->refcount);
344         spin_unlock_irqrestore(&agent->lock, flags);
345         return rmpp_recv;
346 }
347
348 static struct mad_rmpp_recv *
349 insert_rmpp_recv(struct ib_mad_agent_private *agent,
350                  struct mad_rmpp_recv *rmpp_recv)
351 {
352         struct mad_rmpp_recv *cur_rmpp_recv;
353
354         cur_rmpp_recv = find_rmpp_recv(agent, rmpp_recv->rmpp_wc);
355         if (!cur_rmpp_recv)
356                 list_add_tail(&rmpp_recv->list, &agent->rmpp_list);
357
358         return cur_rmpp_recv;
359 }
360
361 static inline int get_last_flag(struct ib_mad_recv_buf *seg)
362 {
363         struct ib_rmpp_mad *rmpp_mad;
364
365         rmpp_mad = (struct ib_rmpp_mad *) seg->mad;
366         return ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_LAST;
367 }
368
369 static inline int get_seg_num(struct ib_mad_recv_buf *seg)
370 {
371         struct ib_rmpp_mad *rmpp_mad;
372
373         rmpp_mad = (struct ib_rmpp_mad *) seg->mad;
374         return be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num);
375 }
376
377 static inline struct ib_mad_recv_buf * get_next_seg(struct list_head *rmpp_list,
378                                                     struct ib_mad_recv_buf *seg)
379 {
380         if (seg->list.next == rmpp_list)
381                 return NULL;
382
383         return container_of(seg->list.next, struct ib_mad_recv_buf, list);
384 }
385
386 static inline int window_size(struct ib_mad_agent_private *agent)
387 {
388         return max(agent->qp_info->recv_queue.max_active >> 3, 1);
389 }
390
391 static struct ib_mad_recv_buf * find_seg_location(struct list_head *rmpp_list,
392                                                   int seg_num)
393 {
394         struct ib_mad_recv_buf *seg_buf;
395         int cur_seg_num;
396
397         list_for_each_entry_reverse(seg_buf, rmpp_list, list) {
398                 cur_seg_num = get_seg_num(seg_buf);
399                 if (seg_num > cur_seg_num)
400                         return seg_buf;
401                 if (seg_num == cur_seg_num)
402                         break;
403         }
404         return NULL;
405 }
406
407 static void update_seg_num(struct mad_rmpp_recv *rmpp_recv,
408                            struct ib_mad_recv_buf *new_buf)
409 {
410         struct list_head *rmpp_list = &rmpp_recv->rmpp_wc->rmpp_list;
411
412         while (new_buf && (get_seg_num(new_buf) == rmpp_recv->seg_num + 1)) {
413                 rmpp_recv->cur_seg_buf = new_buf;
414                 rmpp_recv->seg_num++;
415                 new_buf = get_next_seg(rmpp_list, new_buf);
416         }
417 }
418
419 static inline int get_mad_len(struct mad_rmpp_recv *rmpp_recv)
420 {
421         struct ib_rmpp_mad *rmpp_mad;
422         int hdr_size, data_size, pad;
423
424         rmpp_mad = (struct ib_rmpp_mad *)rmpp_recv->cur_seg_buf->mad;
425
426         hdr_size = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class);
427         data_size = sizeof(struct ib_rmpp_mad) - hdr_size;
428         pad = IB_MGMT_RMPP_DATA - be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
429         if (pad > IB_MGMT_RMPP_DATA || pad < 0)
430                 pad = 0;
431
432         return hdr_size + rmpp_recv->seg_num * data_size - pad;
433 }
434
435 static struct ib_mad_recv_wc * complete_rmpp(struct mad_rmpp_recv *rmpp_recv)
436 {
437         struct ib_mad_recv_wc *rmpp_wc;
438
439         ack_recv(rmpp_recv, rmpp_recv->rmpp_wc);
440         if (rmpp_recv->seg_num > 1)
441                 cancel_delayed_work(&rmpp_recv->timeout_work);
442
443         rmpp_wc = rmpp_recv->rmpp_wc;
444         rmpp_wc->mad_len = get_mad_len(rmpp_recv);
445         /* 10 seconds until we can find the packet lifetime */
446         queue_delayed_work(rmpp_recv->agent->qp_info->port_priv->wq,
447                            &rmpp_recv->cleanup_work, msecs_to_jiffies(10000));
448         return rmpp_wc;
449 }
450
451 static struct ib_mad_recv_wc *
452 continue_rmpp(struct ib_mad_agent_private *agent,
453               struct ib_mad_recv_wc *mad_recv_wc)
454 {
455         struct mad_rmpp_recv *rmpp_recv;
456         struct ib_mad_recv_buf *prev_buf;
457         struct ib_mad_recv_wc *done_wc;
458         int seg_num;
459         unsigned long flags;
460
461         rmpp_recv = acquire_rmpp_recv(agent, mad_recv_wc);
462         if (!rmpp_recv)
463                 goto drop1;
464
465         seg_num = get_seg_num(&mad_recv_wc->recv_buf);
466
467         spin_lock_irqsave(&rmpp_recv->lock, flags);
468         if ((rmpp_recv->state == RMPP_STATE_TIMEOUT) ||
469             (seg_num > rmpp_recv->newwin))
470                 goto drop3;
471
472         if ((seg_num <= rmpp_recv->last_ack) ||
473             (rmpp_recv->state == RMPP_STATE_COMPLETE)) {
474                 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
475                 ack_recv(rmpp_recv, mad_recv_wc);
476                 goto drop2;
477         }
478
479         prev_buf = find_seg_location(&rmpp_recv->rmpp_wc->rmpp_list, seg_num);
480         if (!prev_buf)
481                 goto drop3;
482
483         done_wc = NULL;
484         list_add(&mad_recv_wc->recv_buf.list, &prev_buf->list);
485         if (rmpp_recv->cur_seg_buf == prev_buf) {
486                 update_seg_num(rmpp_recv, &mad_recv_wc->recv_buf);
487                 if (get_last_flag(rmpp_recv->cur_seg_buf)) {
488                         rmpp_recv->state = RMPP_STATE_COMPLETE;
489                         spin_unlock_irqrestore(&rmpp_recv->lock, flags);
490                         done_wc = complete_rmpp(rmpp_recv);
491                         goto out;
492                 } else if (rmpp_recv->seg_num == rmpp_recv->newwin) {
493                         rmpp_recv->newwin += window_size(agent);
494                         spin_unlock_irqrestore(&rmpp_recv->lock, flags);
495                         ack_recv(rmpp_recv, mad_recv_wc);
496                         goto out;
497                 }
498         }
499         spin_unlock_irqrestore(&rmpp_recv->lock, flags);
500 out:
501         deref_rmpp_recv(rmpp_recv);
502         return done_wc;
503
504 drop3:  spin_unlock_irqrestore(&rmpp_recv->lock, flags);
505 drop2:  deref_rmpp_recv(rmpp_recv);
506 drop1:  ib_free_recv_mad(mad_recv_wc);
507         return NULL;
508 }
509
510 static struct ib_mad_recv_wc *
511 start_rmpp(struct ib_mad_agent_private *agent,
512            struct ib_mad_recv_wc *mad_recv_wc)
513 {
514         struct mad_rmpp_recv *rmpp_recv;
515         unsigned long flags;
516
517         rmpp_recv = create_rmpp_recv(agent, mad_recv_wc);
518         if (!rmpp_recv) {
519                 ib_free_recv_mad(mad_recv_wc);
520                 return NULL;
521         }
522
523         spin_lock_irqsave(&agent->lock, flags);
524         if (insert_rmpp_recv(agent, rmpp_recv)) {
525                 spin_unlock_irqrestore(&agent->lock, flags);
526                 /* duplicate first MAD */
527                 destroy_rmpp_recv(rmpp_recv);
528                 return continue_rmpp(agent, mad_recv_wc);
529         }
530         atomic_inc(&rmpp_recv->refcount);
531
532         if (get_last_flag(&mad_recv_wc->recv_buf)) {
533                 rmpp_recv->state = RMPP_STATE_COMPLETE;
534                 spin_unlock_irqrestore(&agent->lock, flags);
535                 complete_rmpp(rmpp_recv);
536         } else {
537                 spin_unlock_irqrestore(&agent->lock, flags);
538                 /* 40 seconds until we can find the packet lifetimes */
539                 queue_delayed_work(agent->qp_info->port_priv->wq,
540                                    &rmpp_recv->timeout_work,
541                                    msecs_to_jiffies(40000));
542                 rmpp_recv->newwin += window_size(agent);
543                 ack_recv(rmpp_recv, mad_recv_wc);
544                 mad_recv_wc = NULL;
545         }
546         deref_rmpp_recv(rmpp_recv);
547         return mad_recv_wc;
548 }
549
550 static int send_next_seg(struct ib_mad_send_wr_private *mad_send_wr)
551 {
552         struct ib_rmpp_mad *rmpp_mad;
553         int timeout;
554         u32 paylen = 0;
555
556         rmpp_mad = mad_send_wr->send_buf.mad;
557         ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
558         rmpp_mad->rmpp_hdr.seg_num = cpu_to_be32(++mad_send_wr->seg_num);
559
560         if (mad_send_wr->seg_num == 1) {
561                 rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_FIRST;
562                 paylen = mad_send_wr->send_buf.seg_count * IB_MGMT_RMPP_DATA -
563                          mad_send_wr->pad;
564         }
565
566         if (mad_send_wr->seg_num == mad_send_wr->send_buf.seg_count) {
567                 rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_LAST;
568                 paylen = IB_MGMT_RMPP_DATA - mad_send_wr->pad;
569         }
570         rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(paylen);
571
572         /* 2 seconds for an ACK until we can find the packet lifetime */
573         timeout = mad_send_wr->send_buf.timeout_ms;
574         if (!timeout || timeout > 2000)
575                 mad_send_wr->timeout = msecs_to_jiffies(2000);
576
577         return ib_send_mad(mad_send_wr);
578 }
579
580 static void abort_send(struct ib_mad_agent_private *agent,
581                        struct ib_mad_recv_wc *mad_recv_wc, u8 rmpp_status)
582 {
583         struct ib_mad_send_wr_private *mad_send_wr;
584         struct ib_mad_send_wc wc;
585         unsigned long flags;
586
587         spin_lock_irqsave(&agent->lock, flags);
588         mad_send_wr = ib_find_send_mad(agent, mad_recv_wc);
589         if (!mad_send_wr)
590                 goto out;       /* Unmatched send */
591
592         if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) ||
593             (!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS))
594                 goto out;       /* Send is already done */
595
596         ib_mark_mad_done(mad_send_wr);
597         spin_unlock_irqrestore(&agent->lock, flags);
598
599         wc.status = IB_WC_REM_ABORT_ERR;
600         wc.vendor_err = rmpp_status;
601         wc.send_buf = &mad_send_wr->send_buf;
602         ib_mad_complete_send_wr(mad_send_wr, &wc);
603         return;
604 out:
605         spin_unlock_irqrestore(&agent->lock, flags);
606 }
607
608 static inline void adjust_last_ack(struct ib_mad_send_wr_private *wr,
609                                    int seg_num)
610 {
611         struct list_head *list;
612
613         wr->last_ack = seg_num;
614         list = &wr->last_ack_seg->list;
615         list_for_each_entry(wr->last_ack_seg, list, list)
616                 if (wr->last_ack_seg->num == seg_num)
617                         break;
618 }
619
620 static void process_ds_ack(struct ib_mad_agent_private *agent,
621                            struct ib_mad_recv_wc *mad_recv_wc, int newwin)
622 {
623         struct mad_rmpp_recv *rmpp_recv;
624
625         rmpp_recv = find_rmpp_recv(agent, mad_recv_wc);
626         if (rmpp_recv && rmpp_recv->state == RMPP_STATE_COMPLETE)
627                 rmpp_recv->repwin = newwin;
628 }
629
630 static void process_rmpp_ack(struct ib_mad_agent_private *agent,
631                              struct ib_mad_recv_wc *mad_recv_wc)
632 {
633         struct ib_mad_send_wr_private *mad_send_wr;
634         struct ib_rmpp_mad *rmpp_mad;
635         unsigned long flags;
636         int seg_num, newwin, ret;
637
638         rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
639         if (rmpp_mad->rmpp_hdr.rmpp_status) {
640                 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
641                 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
642                 return;
643         }
644
645         seg_num = be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num);
646         newwin = be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
647         if (newwin < seg_num) {
648                 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_W2S);
649                 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_W2S);
650                 return;
651         }
652
653         spin_lock_irqsave(&agent->lock, flags);
654         mad_send_wr = ib_find_send_mad(agent, mad_recv_wc);
655         if (!mad_send_wr) {
656                 if (!seg_num)
657                         process_ds_ack(agent, mad_recv_wc, newwin);
658                 goto out;       /* Unmatched or DS RMPP ACK */
659         }
660
661         if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) &&
662             (mad_send_wr->timeout)) {
663                 spin_unlock_irqrestore(&agent->lock, flags);
664                 ack_ds_ack(agent, mad_recv_wc);
665                 return;         /* Repeated ACK for DS RMPP transaction */
666         }
667
668         if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) ||
669             (!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS))
670                 goto out;       /* Send is already done */
671
672         if (seg_num > mad_send_wr->send_buf.seg_count ||
673             seg_num > mad_send_wr->newwin) {
674                 spin_unlock_irqrestore(&agent->lock, flags);
675                 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_S2B);
676                 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_S2B);
677                 return;
678         }
679
680         if (newwin < mad_send_wr->newwin || seg_num < mad_send_wr->last_ack)
681                 goto out;       /* Old ACK */
682
683         if (seg_num > mad_send_wr->last_ack) {
684                 adjust_last_ack(mad_send_wr, seg_num);
685                 mad_send_wr->retries_left = mad_send_wr->max_retries;
686         }
687         mad_send_wr->newwin = newwin;
688         if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) {
689                 /* If no response is expected, the ACK completes the send */
690                 if (!mad_send_wr->send_buf.timeout_ms) {
691                         struct ib_mad_send_wc wc;
692
693                         ib_mark_mad_done(mad_send_wr);
694                         spin_unlock_irqrestore(&agent->lock, flags);
695
696                         wc.status = IB_WC_SUCCESS;
697                         wc.vendor_err = 0;
698                         wc.send_buf = &mad_send_wr->send_buf;
699                         ib_mad_complete_send_wr(mad_send_wr, &wc);
700                         return;
701                 }
702                 if (mad_send_wr->refcount == 1)
703                         ib_reset_mad_timeout(mad_send_wr,
704                                              mad_send_wr->send_buf.timeout_ms);
705                 spin_unlock_irqrestore(&agent->lock, flags);
706                 ack_ds_ack(agent, mad_recv_wc);
707                 return;
708         } else if (mad_send_wr->refcount == 1 &&
709                    mad_send_wr->seg_num < mad_send_wr->newwin &&
710                    mad_send_wr->seg_num < mad_send_wr->send_buf.seg_count) {
711                 /* Send failure will just result in a timeout/retry */
712                 ret = send_next_seg(mad_send_wr);
713                 if (ret)
714                         goto out;
715
716                 mad_send_wr->refcount++;
717                 list_move_tail(&mad_send_wr->agent_list,
718                               &mad_send_wr->mad_agent_priv->send_list);
719         }
720 out:
721         spin_unlock_irqrestore(&agent->lock, flags);
722 }
723
724 static struct ib_mad_recv_wc *
725 process_rmpp_data(struct ib_mad_agent_private *agent,
726                   struct ib_mad_recv_wc *mad_recv_wc)
727 {
728         struct ib_rmpp_hdr *rmpp_hdr;
729         u8 rmpp_status;
730
731         rmpp_hdr = &((struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad)->rmpp_hdr;
732
733         if (rmpp_hdr->rmpp_status) {
734                 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_STATUS;
735                 goto bad;
736         }
737
738         if (rmpp_hdr->seg_num == __constant_htonl(1)) {
739                 if (!(ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST)) {
740                         rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG;
741                         goto bad;
742                 }
743                 return start_rmpp(agent, mad_recv_wc);
744         } else {
745                 if (ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST) {
746                         rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG;
747                         goto bad;
748                 }
749                 return continue_rmpp(agent, mad_recv_wc);
750         }
751 bad:
752         nack_recv(agent, mad_recv_wc, rmpp_status);
753         ib_free_recv_mad(mad_recv_wc);
754         return NULL;
755 }
756
757 static void process_rmpp_stop(struct ib_mad_agent_private *agent,
758                               struct ib_mad_recv_wc *mad_recv_wc)
759 {
760         struct ib_rmpp_mad *rmpp_mad;
761
762         rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
763
764         if (rmpp_mad->rmpp_hdr.rmpp_status != IB_MGMT_RMPP_STATUS_RESX) {
765                 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
766                 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
767         } else
768                 abort_send(agent, mad_recv_wc, rmpp_mad->rmpp_hdr.rmpp_status);
769 }
770
771 static void process_rmpp_abort(struct ib_mad_agent_private *agent,
772                                struct ib_mad_recv_wc *mad_recv_wc)
773 {
774         struct ib_rmpp_mad *rmpp_mad;
775
776         rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
777
778         if (rmpp_mad->rmpp_hdr.rmpp_status < IB_MGMT_RMPP_STATUS_ABORT_MIN ||
779             rmpp_mad->rmpp_hdr.rmpp_status > IB_MGMT_RMPP_STATUS_ABORT_MAX) {
780                 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
781                 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
782         } else
783                 abort_send(agent, mad_recv_wc, rmpp_mad->rmpp_hdr.rmpp_status);
784 }
785
786 struct ib_mad_recv_wc *
787 ib_process_rmpp_recv_wc(struct ib_mad_agent_private *agent,
788                         struct ib_mad_recv_wc *mad_recv_wc)
789 {
790         struct ib_rmpp_mad *rmpp_mad;
791
792         rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
793         if (!(rmpp_mad->rmpp_hdr.rmpp_rtime_flags & IB_MGMT_RMPP_FLAG_ACTIVE))
794                 return mad_recv_wc;
795
796         if (rmpp_mad->rmpp_hdr.rmpp_version != IB_MGMT_RMPP_VERSION) {
797                 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_UNV);
798                 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_UNV);
799                 goto out;
800         }
801
802         switch (rmpp_mad->rmpp_hdr.rmpp_type) {
803         case IB_MGMT_RMPP_TYPE_DATA:
804                 return process_rmpp_data(agent, mad_recv_wc);
805         case IB_MGMT_RMPP_TYPE_ACK:
806                 process_rmpp_ack(agent, mad_recv_wc);
807                 break;
808         case IB_MGMT_RMPP_TYPE_STOP:
809                 process_rmpp_stop(agent, mad_recv_wc);
810                 break;
811         case IB_MGMT_RMPP_TYPE_ABORT:
812                 process_rmpp_abort(agent, mad_recv_wc);
813                 break;
814         default:
815                 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BADT);
816                 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BADT);
817                 break;
818         }
819 out:
820         ib_free_recv_mad(mad_recv_wc);
821         return NULL;
822 }
823
824 static int init_newwin(struct ib_mad_send_wr_private *mad_send_wr)
825 {
826         struct ib_mad_agent_private *agent = mad_send_wr->mad_agent_priv;
827         struct ib_mad_hdr *mad_hdr = mad_send_wr->send_buf.mad;
828         struct mad_rmpp_recv *rmpp_recv;
829         struct ib_ah_attr ah_attr;
830         unsigned long flags;
831         int newwin = 1;
832
833         if (!(mad_hdr->method & IB_MGMT_METHOD_RESP))
834                 goto out;
835
836         spin_lock_irqsave(&agent->lock, flags);
837         list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
838                 if (rmpp_recv->tid != mad_hdr->tid ||
839                     rmpp_recv->mgmt_class != mad_hdr->mgmt_class ||
840                     rmpp_recv->class_version != mad_hdr->class_version ||
841                     (rmpp_recv->method & IB_MGMT_METHOD_RESP))
842                         continue;
843
844                 if (ib_query_ah(mad_send_wr->send_buf.ah, &ah_attr))
845                         continue;
846
847                 if (rmpp_recv->slid == ah_attr.dlid) {
848                         newwin = rmpp_recv->repwin;
849                         break;
850                 }
851         }
852         spin_unlock_irqrestore(&agent->lock, flags);
853 out:
854         return newwin;
855 }
856
857 int ib_send_rmpp_mad(struct ib_mad_send_wr_private *mad_send_wr)
858 {
859         struct ib_rmpp_mad *rmpp_mad;
860         int ret;
861
862         rmpp_mad = mad_send_wr->send_buf.mad;
863         if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
864               IB_MGMT_RMPP_FLAG_ACTIVE))
865                 return IB_RMPP_RESULT_UNHANDLED;
866
867         if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA) {
868                 mad_send_wr->seg_num = 1;
869                 return IB_RMPP_RESULT_INTERNAL;
870         }
871
872         mad_send_wr->newwin = init_newwin(mad_send_wr);
873
874         /* We need to wait for the final ACK even if there isn't a response */
875         mad_send_wr->refcount += (mad_send_wr->timeout == 0);
876         ret = send_next_seg(mad_send_wr);
877         if (!ret)
878                 return IB_RMPP_RESULT_CONSUMED;
879         return ret;
880 }
881
882 int ib_process_rmpp_send_wc(struct ib_mad_send_wr_private *mad_send_wr,
883                             struct ib_mad_send_wc *mad_send_wc)
884 {
885         struct ib_rmpp_mad *rmpp_mad;
886         int ret;
887
888         rmpp_mad = mad_send_wr->send_buf.mad;
889         if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
890               IB_MGMT_RMPP_FLAG_ACTIVE))
891                 return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */
892
893         if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA)
894                 return IB_RMPP_RESULT_INTERNAL;  /* ACK, STOP, or ABORT */
895
896         if (mad_send_wc->status != IB_WC_SUCCESS ||
897             mad_send_wr->status != IB_WC_SUCCESS)
898                 return IB_RMPP_RESULT_PROCESSED; /* Canceled or send error */
899
900         if (!mad_send_wr->timeout)
901                 return IB_RMPP_RESULT_PROCESSED; /* Response received */
902
903         if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) {
904                 mad_send_wr->timeout =
905                         msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
906                 return IB_RMPP_RESULT_PROCESSED; /* Send done */
907         }
908
909         if (mad_send_wr->seg_num == mad_send_wr->newwin ||
910             mad_send_wr->seg_num == mad_send_wr->send_buf.seg_count)
911                 return IB_RMPP_RESULT_PROCESSED; /* Wait for ACK */
912
913         ret = send_next_seg(mad_send_wr);
914         if (ret) {
915                 mad_send_wc->status = IB_WC_GENERAL_ERR;
916                 return IB_RMPP_RESULT_PROCESSED;
917         }
918         return IB_RMPP_RESULT_CONSUMED;
919 }
920
921 int ib_retry_rmpp(struct ib_mad_send_wr_private *mad_send_wr)
922 {
923         struct ib_rmpp_mad *rmpp_mad;
924         int ret;
925
926         rmpp_mad = mad_send_wr->send_buf.mad;
927         if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
928               IB_MGMT_RMPP_FLAG_ACTIVE))
929                 return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */
930
931         if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count)
932                 return IB_RMPP_RESULT_PROCESSED;
933
934         mad_send_wr->seg_num = mad_send_wr->last_ack;
935         mad_send_wr->cur_seg = mad_send_wr->last_ack_seg;
936
937         ret = send_next_seg(mad_send_wr);
938         if (ret)
939                 return IB_RMPP_RESULT_PROCESSED;
940
941         return IB_RMPP_RESULT_CONSUMED;
942 }